Pulsator valve



' pressure,

Patented Sept. 9, 1924.

UNITED STATT-:s

SVEN LEONARD SUNDBERG, OF STOCKHOLM, SWEDEN.

PULSATOR VALVE.

Application filed February 6, 1923-. Ser-iai No. 617,278.

Be it known that I, SVEN LEONARD SUND- Bnnc, a subject of the King of Sweden, re- Siding'at Stockholm, Sweden, have invented new and useful Improvements in Pulsator` Valves, of which the following is a specication. A f

- The present invention refers toa pulsator.- valve intended for causing pressure variations in a chamber or duct by meansfof a vacuum and .consisting of `a valve-memberl mounted in Ia valve-casing and adapted to reciprocate between two eXtreme positions 1n such a manner that 4the valve-member with every stroke closes a valve-opening i-n its respective extreme positions from the inside of the valve-casing, .the reciprocatory move.- ment .of whi'h valve-member is brought about by `alternately decreasing and increasing the pressure in a pressure variation chamber or .duct ywhich is in constant communication withcone ofthe .two constantly .communicating .chambers ofthe valvefcasyin .on opposite sides ofthe valve-member, .in which connection the valve-member itself controls vnot only the :opening and closing of one of the valve openings, which forms an inlet portto fthe valvecasing and thus to, the pressure variation chamber or duct for a huid, rintended for increase .of pressure in `this latter, but also :the closing of the other valve-opening, which forms a Commun-ication port Y.between vthe vacuum-chamber or vduct intended for producing the decrease of 4and the said pressure variation chamber or duct. Valves of this kind have previously 'been suggested for usein milking machines working with a vacuum, but' possess certain inconveniences .or drawbacks, as will be seeny from the following. These inconveniences or drawbacksare done away with by the ,presentinvention by reason of .the lfact that the member, which closes the communication ,port ,between the vacuum l'chamber or Vduct ,and `the pressure variation chamber or .d uct, is connected to thevalve member Vin such a manner as to 4be carried along iby the valve :member vin its movement not `only 'as in 'the ordinary way towards, but .also ,away from, the said communication y,port for .the purpose that 'not only theclosing but `also the opening of the .latter maybe controlled by the valve-member. The` valve ac- ,cording to. the .present invention, which may .be Vused for many different purposes, is also specially suitable for use in the above mentioned kind of milkingsmachines.

On the laccompanying drawing only by 1 way of example and in vertical section one teat-cup for a milking-machine yis shown with a valveconstructedaccording to the invention. y

l is the outer, lst iif, tubular wall of the treat-cup and 2 the .rubber tube inserted in the saine. This basin the'om'offon struction yshown 'at its lower end radial chanf nels 3, whichcommunicateV each withoneof a plurality of chambers 't between thewall l and the rubber tube 2, which v'chambers form the. -above .mentioned pressure variation chamber or duct. vIn the lower end of the rubbertube isinserted a conicaliplugv 5, which rests or 'presses against a flange 6 in the rubber tube; In lthe plug 5 there is a chamber 7 from which issues a vrtube 8 adapt# ed vto be connected with the milk-pail (not shown) in which a constantvacu-um is maintained. The milk-pail. andftube 8 form .the aforesaid vacuum chamber v,or duct. .The 4teat chamber 9 and thechamber 7 are in constant ,communicationv with leach other. In, the lower end of `:the plug 5. isfaStenedthe valve hema-concerned. 10 ,is thevalve-.casi'ng and.y 111 a 'valve-memberrectprocable in the same, between anu-pp er and a lower extreme inlet openings to the valve,

position. 12 are casing `communieating with the atmosphere and 13 a-valve-seat for.ltheflowermushroomshaped portion of the valve-member .said valve-seat communicating with V the inlets. 12. 1411's van ,upper valve-seat in the plug 5 for a mushroomeshaped member in the form of. a stud 15screwedinto'the valveainernber.` The valve-seat lt is, 4bymeans `of-atube 16 and holes 17, in communication with the chamber f7, Furthermore, .the valve-casing 10 is, v throngha channel 1 8 ,and an annulargroove 19' ,in the ,plug .5., with .th Chambers 4f, llllllly, aboveand below1 '.t he valve-,member arein means of channels 20 in' the valvemember .constant 'communication .with each other br- ,suitably proportioned to theirrarea, e and through l.the ,pla-y or lost ,motion between" the valvesmember and the .inner wallk of .the valve-casing. As will be yseen the `area of [the .valvefseat valveseatv 14.' lThe member im'ay be adjustable through the vlength lfofflthe valve-member .reckoned be-Yl in constant communication the chambers 13 ,is greater than .that o f. the Y stroke of .the valve-1 lic tween the extreme positions, or the distance between the extreme positions, or both being adjustable. In the example shown the stroke of the valve-member is adjustable by the length of the valve-membery between the valve-seats being adjustable through screwing the stud 15 further into or out of the valve-member.

The form of construction shown operates in the following manner: The teat is inserted into the teat-chamber 9 and the tnbe 8 connected up with the milk-pail, in which a vacuum of, say 350 mm. is kept up. A vacuum is thus also caused in the chamber 7, the jfeat-chamber 9, and, when the valvemember is in its lower position, also in the valve-casing 1() and the chambers 4. On account of the vacuum in the position shown in kthe `drawing being equal on both sides of the rubber tube, the same occupies the position shown in the drawing. Owing to the fact that the area of the valve-seat 13 and the weight of the valve-member are specially balanced with regard to the size of the vacuum, theoutside air forces up the valve-member to its upper. valve-seat 14.`

When this has been closed by the stud 15, the chambers 4 are shut oi'f from the vacuum, and the outside atmospheric pressure commences to make itself felt in them while a vacuum continues to exist in the teat-chamber 9. This causes the rubber tube to be pressed in towards the teat. But shortly after, the valve-member by means of its weight and on account of the size of the area of the valve-seat 14 in regards to the vacuum, can return to its' lower extreme position, after which the .valve-member again moves upwards, as previously described, and thus reciprocates between its extreme positions, as long as the vacuum is kept up in the teat-chamber 9. By this means an even and reliable pulsating movement for acting upon the teat is imparted to the rubber tube.

In the case of the previously mentioned, known valve, called ball-pulsator, the opening of the communication port between the vacuum-chamber and the pressure-variation chambers member. For this reason it may happen that the ball-valve member which shuts the last mentioned port, locks itself to the same so that the valve must be takento pieces and put in order again. Besides, it may happen that the machine works with a higher vacuum than permissible without this being discovered, and the teat or udder may thus easily be damagedor hurt. These drawbacks are completely removed by the present invention. If, for example the vacuum in the present invention for some cause lor other should exceed a certain limit, the valvevr remains in its upper position and the action upon'the teat ceases so that the defect is is not controlled by the valve-.

easily discovered and must be remedied before milking can proceed. By the channels 20 being properly balanced or dimensioned in relation to their area, which may be adjustable (not shown), the valve-inember can be given a speed properly adapted for acting upon the tea-t.

Clearly the separate parts of the form of construction shown may be varied in many ways, provided only the characteristics of the invention be retained. For example the useful force of gravitation of the valve-mem-- ber may be replaced by soineother force, for instance a spring or the force of another` similar pulsator-valve, the valve-member .of which is connected to the other valve-mem]- ber in such a manner that both. valve-members cooperate with each' other but move in opposite directions to each other.;

lVhat I claim is:

1. A device of the class described, comprising, in combinatioma double-walled vessel having a variable pressure chamber between its walls, a valve casing in communication with said chamber and withthe interior of the vessel, ysaid valve casing being provided with an air-inlet port of greater diameter than that of its communica# tion with the vessel, a reciprocatoryI valvev member in said casing radapted'alternately to close said port and said communication with the vessel, said valve being provided.

with a plurality of channels communicating with said variable pressure 'chamber and said air-inlet port, and means for placing said vesselin communication with a vacuum producing machine.

2. A device of the class described, comprising, in combination, a double-walled vesal variable pressure chamber `between its walls, a valve casing in communication with sel having a plurality of channels forming 9,5

said channels and with the interior of the Y vessel., said valve casing #being providedy with an air-inlet portof greater diameter than that of its communication with the vessel, areciprocatory valvemember in said casing adapted to alternately close said port and said communication with the vessel,= means for adjusting the `tion of said valve member, said valve mem-` ber being provided with a plurality of chan nels in communica-tion with said variable pressure chamber and said air-inlet port,

and means for placing said vessel in com municationl vice. Y

3, A device of thel class described, comprising, in combination, a. double-walled with a vacuum producingqdel vessel having `a variable pressure chamber .125" ybetween its walls, a valve casing in communication with saidchamber and with the interiorof the vessel,- said valve casing being provided with an air-.inlet port, a

reciprocatciyvalve member in said casing' [139 limits of reciproca` 11,5 i

adapted alternately to closel said port and the valve member being so proportioned to said communication with lche vessel, said the amount of vacuum that the valve mem- 10 valve being provided With a. plurality of ber is moved in one direction by atmospheric channels communicating With said variable pressure and in the opposite direction byv 5 pressure chamber and said air-inlet port, and gravity.

means for placing said vessel in communica- In testimony whereof I have signed myl y tion with a vacuum producing device, the name to this speciication. t area of the inlet port and the Weight of SVEN LEONARD SUNDBERG. 

